To Next PageTo Next PageWhat to do if my Carrier 48FC 05 Air Conditioner completely stops?
If your Carrier Air Conditioner stops completely, first, check the faults and alerts list to understand why it shut down. After identifying and fixing the issue, restart the unit. It's recommended to diagnose the unit in Service Test mode before running it normally and reset any faults before the control function can operate.
What does Fault F010 mean on my Carrier 48FC 05?
Fault F010 on your Carrier Air Conditioner indicates a low voltage issue, possibly due to a brownout, low supply voltage, or a missing phase in the supply power. The control system will shut down the unit, but it should automatically clear once the supply voltage rises above 19 volts AC.
What does Fault F011 mean on my Carrier 48FC 05 Air Conditioner?
Fault F011 indicates that the MBB reference voltage is out of range, usually due to an MBB failure or the supply voltage being out of range. The control system will shut down the unit. This fault should automatically clear when the DC reference voltage returns to its normal range.
What does Alert A012 mean on my Carrier 48FC 05?
Alert A012 on your Carrier Air Conditioner signals an MBB zero crossing issue, often caused by an MBB failure or the supply voltage frequency being too high or too low. The alert should automatically clear once the supply voltage returns to the normal range.
What does Fault F013 mean on my Carrier 48FC 05?
Fault F013 on your Carrier Air Conditioner indicates that MBB Fuse 2 is open, typically due to a wiring error in a switch input or the switch pulling too much current. The control will shut down the unit, but the fault should automatically clear when the fuse temperature returns to normal.
What does Fault F014 mean on my Carrier Air Conditioner?
Fault F014 on your Carrier Air Conditioner means that MBB Fuse 3 is open. This is usually caused by a wiring error in a switch input or the switch drawing too much current. The control system will shut down the unit, and the fault should clear automatically once the fuse temperature is back in the normal range.
What does Alert A015 mean on my Carrier 48FC 05 Air Conditioner?
Alert A015 on your Carrier Air Conditioner indicates that the MBB RNET voltage is out of range, generally due to an MBB failure or the supply voltage being out of range. The alert should automatically clear when the voltage returns to its normal range.
What does Alert A016 mean on my Carrier 48FC 05 Air Conditioner?
Alert A016 on your Carrier Air Conditioner indicates that the MBB 24VDC voltage is out of range, usually due to an MBB failure or the supply voltage being out of range. When this alert is active, Analog Input numbers 6, 7, and 8 will be in error. The alert should automatically clear when the voltage rises above 19 volts DC.
What does Alert A017 mean on my Carrier 48FC 05 Air Conditioner?
Alert A017 on your Carrier Air Conditioner indicates that the MBB 5VDC voltage is out of range, typically caused by an MBB failure or the supply voltage being out of range. When this alert is active, transducer inputs will be in error. The alert should automatically clear when the voltage rises above 4.5 volts DC.
What does Fault F018 mean on my Carrier 48FC 05 Air Conditioner?
Fault F018 on your Carrier Air Conditioner indicates an MBB EEPROM failure, meaning the serial EEPROM chip on the MBB, which stores the unit’s configuration, is not responding. Recovery is automatic, but you might need to replace the MBB board. Before replacing the board, try cycling the power to the control.
General| Brand | Carrier |
|---|---|
| Model | 48FC 05 |
| Category | Air Conditioner |
| Language | English |
General safety precautions for installation, servicing, and operation of air-conditioning equipment.
Procedures and checks required before initial unit operation, including preparation and electrical checks.
Overview of the SystemVu control system as a comprehensive unit-management solution.
Details the keypad interface for accessing control information, reading values, and testing the unit.
Describes the initial startup process for the SystemVu controller, requiring Quick Setup, Network Setup, and System Auto Test.
Lists common adjusted configurations set during startup, requiring completion of the QUICK SET CHKLIST point.
Shortcut to network settings required for network piece operation, requiring completion of NETWORK CHKLIST.
Enables test mode to execute the System Auto Test, which must be completed before setting this to done.
Instructions for wiring accessory thermostats and configuring thermostat hardware type.
Details wiring accessory space temperature sensors to T-55 terminals and setting UNIT CONTROL TYPE to Space Sensor.
Guides on configuring BAS PROTOCOL to CCN and specific CCN menu settings for communication.
Details configuring the unit for a field-installed economizer via SETTINGS->UNIT CONFIGURATIONS->ECONOMIZER->VENT METHOD.
Explains thermostat inputs on TB1 and the UNIT CONTROL TYPE configuration for input recognition.
Describes the alarm output relay for indicating active alarms and its channel configuration.
Covers configurations indicating factory options, field accessories, and general operation variables.
Configuration defining the filter life, activating an alert upon expiration.
Configuring the FIRE SHUTDOWN SW for normally open or closed states.
Details programming operating schedules with eight separate periods for flexibility.
Describes the INDEPENDENTS submenu for testing economizer, Humidi-MiZer valves, power exhaust, etc.
Details the FAN TESTS submenu for setup and testing of indoor fan speeds.
Explains the COOL submenu for changing output status of compressors and Humidi-MiZer system operation.
Explains the HEAT submenu for changing output status of heat stages and gas/electric operation.
Describes the AUTOMATIC TEST submenu for executing applicable system tests, including independent components, cooling, and heating.
Details the five physical board switch inputs and three analog inputs and their configurations.
Explains how the control determines the overall demand based on control type, alarms, and user interaction.
Details how demand is determined when thermostat control is configured, based on thermostat inputs.
Explains how demand is determined when space sensor control is configured using sensor inputs and setpoints.
Details setpoint configurations found in the SETTINGS->SPACE SET POINTS submenu.
Describes space sensor staging control as an adaptive anticipation control.
Explains the Staged Air Volume (SAV) method and fan speed configurations for various modes.
Defines the fan speed used in Ventilation (fan-only) mode.
Describes the cooling operation, including demand and mode determination, and available sub-modes.
Explains how demand and supply air temperature determine cooling stages.
Details how compressor control works with staging, considering time guards and diagnostics.
Describes two additional HVAC modes: Dehumidification and Dehum/Mech Cooling.
Covers demand and mode determination, staging requests, and handling gas or electric heat.
Determines demand and how to satisfy it with heating stages, considering thermostat or space sensor control.
Explains IAQ measurement using CO2 sensors and modes of operation affected by IAQ configurations.
Explains alerts (AXXX) and faults (FXXX) and how they affect unit operation.
Lists several conditions that can cause a complete unit stoppage.
Steps to restart the machine after a shutdown, including checking faults and alerts.
How active alarms are indicated and how to review and clear them via local display or network.
Identifies potential causes of communication failures and how to diagnose them using an ohm meter.
Guidance for viewing cooling status, diagnosing alarms, and verifying configurations for cooling operation.
Steps for viewing cooling status and diagnosing Humidi-MiZer specific issues.
Steps to troubleshoot economizer status, alerts, faults, and mechanical components.
Guidance for viewing heating status, diagnosing alarms, and verifying configurations for heating operation.
Reference to Table 17 for general gas heating service analysis and IGC board logic.
Monitors three-phase electrical system for phase reversal and phase loss protection.
Explains how SystemVu controller uses thermistors for temperature sensing and troubleshooting.
Explains how electronic control uses suction and discharge pressure transducers and their troubleshooting.
Explains the IGC's role in controlling the direct spark ignition system and monitoring safety switches.
Details compressor, fan motor, and system protection devices like overcurrent, high-pressure switches, and overflow switches.
Provides access to the Service Test menu for testing various system components.
Tests independent outputs like economizer position and compressor bump tests.
Performs compressor bump tests for A1.
Accesses the FAN TESTS menu for indoor and outdoor fan tests.
Accesses the COOLING Test Menu for testing cooling stages and components.
Tests cooling with Compressor A1.
Accesses the HEATING Test Menu for testing heating stages.
Tests heating stage 1.
Tests heating stage 2.
Tests indoor fan speed.
Defines setpoints for occupied and unoccupied cooling/heating, including gaps and offsets.
General unit configurations including startup delay, control types, and thermostat hardware.
Configuration settings for indoor fan speeds (Vent, Heat, Free Cool, Low Cool, High Cool).
General unit configurations including startup delay, control types, and thermostat hardware.
Resets all current alarms.
Displays parameters related to cooling diagnostics, including free cooling and compressor information.
Displays parameters for cooling diagnostics, including lockout conditions and temperature limits.
Displays parameters related to heating diagnostics, including lockout conditions and stage status.
Defines setpoint values for occupied and unoccupied cooling/heating, including gaps and offsets.
Unit configuration settings including startup delay, control types, thermostat type, and ventilation method.
Configuration settings for cooling operation, including compressor timings and setpoints.
Configuration settings for heating operation, including type of heat, stages, and timings.
Economizer configuration settings including ventilation method and damper positions.
Menu for service configurations like compressor framework and shutdown settings.
Setting the control type for temperature sensing (thermostat, space, or return air).
Settings for building network configuration, including BAS protocol and timeouts.
BACnet network configuration menu, including MAC address and baud rate.
A checklist for procedures required before unit startup, including packaging removal and component verification.
Verification steps before starting the unit, covering packaging, installation, and connections.
Checks for supply voltage, compressor amps, electric heat amps, and fan amps.
Steps for starting up the Humidi-MiZer system, including using service test mode.
Recording suction pressure, discharge pressure, entering air temperature, and liquid line temperature.
